22 ARKIV FOR BOTANIK. BAND ll. w:o 3. 
P. sericeo-mollis n. sp. — Fig. 7. 
Albus, mollis, immo mollissimus, 1—3 mm. crassus, resu- 
pinatus, laxe adhaerens, margine saepe secedens, sed vix reflexus 
licet in statu sicco interdum incurvus. Hymenium album vel 
demum aliquando cremeo-pallidum. Pori vulgo angulati, in 
spec. lapp. circ. 3 per mm., in ceteris varii. Hyphae fibulato- 
septatae, 2—4 u latae. Basidia 4-spora, 205 p. Sporae 
ellipsoideae, 4—6 x 2—3 y. 
On rotten coniferous wood at Nattavara. — Found also 
at Umea (by VLEUGEL) and in several places at Stockholm. 
Some specimens which seem to belong to this plant are 
partly or totally reduced into a floccose-pulveraceous state of 
sulphurous or pallid color, which contains abundant subglobose 
or ellipsoidal, apparently asperulate, 1-guttate chlamydospores 
of 5—7'/,x4—5 wu, not unlike those of Ptychogaster albus, 
though more hyaline. 
At Femsjö I have met with a variety (or perhaps distinct 
species!) with hanging cucullate pilei of about 1—4 cm. diam., 
growing on a dead trunk of Abies between the loose bark and 
the wood and having about the same basidiospores but the 
hymenium darker or as it were sordid, at least in the dried state, 
and associate with this variety grew a fibrous-pulveraceous 
Ptychogaster of about isabelline color, still more like small 
specimens of Ptychogaster albus. 
Both the variety and the typical form belong probably 
to the form series named Pol. Vaillantii in MEz, Der Haus- 
schwamm, p. 93. I do not think, however, that either of them 
is the true Pol. Vaillantii of Frızs. I know but one plant which 
agrees well with FRIES” description of that species and this is 
the one which BRESADOLA calls Poria mollusca. That this is 
really identical with FRrEs' Pol. Vaillantii seems to be confirmed 
also by a collection in BLYTT's herbarium which was so deter- 
mined by BLYTT and approved by FnRrEs. The fact that a spe- 
cimen of the same plant in FRIES” herbarium (Upl. Halmbyboda 
1853) is named Pol. molluscus (though not in Erras FRIES” 
own handwriting) seems to contradict this opinion. Taking 
into consideration, however, that specimens in BLYTT'S herba- 
rium named or approved by FRIES as »Pol. molluscus» belong 
the one to Pol. hymenocystis B. & Bn. and the other to Poria 
cinerescens BRES., we must admit that it would be absurd to 
! Possibly P. fibula? 
